<template>
	<div class="sc-form-table">
		<el-table ref="table" :key="toggleIndex" :data="data" border stripe>
			<el-table-column type="index" width="50" fixed="left">
				<template #header>
					<el-button type="primary" icon="el-icon-plus" size="small" circle @click="rowAdd"></el-button>
				</template>
				<template #default="scope">
					<div class="sc-form-table-handle">
						<span>{{ scope.$index + 1 }}</span>
						<el-button
							type="danger"
							icon="el-icon-delete"
							size="small"
							plain
							circle
							@click="rowDel(scope.row, scope.$index)"
						></el-button>
					</div>
				</template>
			</el-table-column>
			<el-table-column v-if="dragSort" label="" width="58">
				<template #default>
					<el-tag class="move" style="cursor: move"><el-icon-d-caret style="width: 1em; height: 1em" /></el-tag>
				</template>
			</el-table-column>
			<slot></slot>
			<template #empty>
				{{ placeholder }}
			</template>
		</el-table>
	</div>
</template>

<script>
import Sortable from 'sortablejs'

export default {
	props: {
		modelValue: { type: Array, default: () => [] },
		addTemplate: { type: Object, default: () => {} },
		placeholder: { type: String, default: '暂无数据' },
		dragSort: { type: Boolean, default: false }
	},
	data() {
		return {
			data: [],
			toggleIndex: 0
		}
	},
	mounted() {
		this.data = this.modelValue
		if (this.dragSort) {
			this.rowDrop()
		}
	},
	watch: {
		modelValue() {
			this.data = this.modelValue
		},
		data: {
			handler() {
				this.$emit('update:modelValue', this.data)
			},
			deep: true
		}
	},
	methods: {
		rowDrop() {
			const _this = this
			const tbody = this.$refs.table.$el.querySelector('.el-table__body-wrapper tbody')
			Sortable.create(tbody, {
				handle: '.move',
				animation: 300,
				ghostClass: 'ghost',
				onEnd({ newIndex, oldIndex }) {
					const tableData = _this.data
					const currRow = tableData.splice(oldIndex, 1)[0]
					tableData.splice(newIndex, 0, currRow)
					_this.toggleIndex += 1
					_this.$nextTick(() => {
						_this.rowDrop()
					})
				}
			})
		},
		rowAdd() {
			const temp = JSON.parse(JSON.stringify(this.addTemplate))
			this.data.push(temp)
		},
		rowDel(row, index) {
			this.data.splice(index, 1)
		}
	}
}
</script>

<style scoped>
.sc-form-table {
	width: 100%;
}
.sc-form-table .sc-form-table-handle {
	text-align: center;
}
.sc-form-table .sc-form-table-handle span {
	display: inline-block;
}
.sc-form-table .sc-form-table-handle button {
	display: none;
}
.sc-form-table .hover-row .sc-form-table-handle span {
	display: none;
}
.sc-form-table .hover-row .sc-form-table-handle button {
	display: inline-block;
}
</style>
